References are said throughout that are sexual.

In one part of the movie, Buck tells Chuck that they should "Suck & Fuck".

There's a scene where Buck spies on Chuck, having sex with his fiancee. Although no nudity is visible, the audience knows what is happening.

None.

Typical R rated language.

Words like "fuck", "shit", "crap", etc.

There's scenes where Alcohol is consumed throughout, during the bar and party scenes.

This movie will be emotionally intense for many.

The whole movie revolves around a man who is immature for his age and is yet socially awkward. A couple scenes where Buck cries makes the audience feel sympathetic.

Basically, the plot of him stalking his best friend can draw some people off and the fact Buck doesn't realize that it's stalking. Watch with caution, because this is not a laugh-out loud comedy.